The Achilles tendon is attached to the rear of the foot as shown in ( Figure 1 )
ID: 1284870 • Letter: T
Question
The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 75kg and D is twice as long as d.
B.) Find the (downward) force FB exerted by the lower leg bone on the foot.
Express your answer to two significant figures and include the appropriate units.
CommentFigure 12-63
The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the ball of one foot. Assume the person has a mass of 75kg and D is twice as long as d. B.) Find the (downward) force FB exerted by the lower leg bone on the foot. Express your answer to two significant figures and include the appropriate units. CommentFigure 12-63Explanation / Answer
Normal reaction at "ball of one foot." must balance the person's weight
N = mg = 75 * 9.8 = 735 N
Ft + N = Fb - >1
consider moments balance about "ball of one foot"
Fb*D = Ft* (D+d)
Fb = 3Ft
Ft = Fb/3 -> 2
substitute 2 in 1
N = 2Fb/3
Fb = 1102.5 N
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.